I think that it is essential for all writers to trust themselves and their work. Believe that your work has potential. How can you make others believe that if you do not? I know many times we feel unworthy of that kind of assurance, but always doubting yourself and your writing is just too exhausting on the long run. I am not always as confident as I would like to be, but I try to remind myself that my creative efforts are a huge achievement. At least and I can always improve and correct most errors through editing. As a writer self-belief is essential. You need to believe and trust in yourself and your talent. You just have to.
Thank you, Alex J. Cavanaugh for creating the Insecure Writers Support Group. You guys can visit Alex over at http://alexjcavanaugh.blogspot.com.